Walter knowles trotman



S N A M T 0 R T K W (No Model.)

APPARATUS FOR WATERMARKING PAPER. No. 532,252.

Patented Jan. 8, 1895.

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W. K. TROTMAN. APPARATUS FOR WATBRMARKING PAPER.

- No. 532,252. Patented Jan. 8, 1895;

. @wm w Dix W UNITED STATES PATENT OFFICE.

WALTER KNOWLES TROTMAN, OF LONDON, ENGLAND. v

APPARATUS FOR WATERMARKING PAPER.

SPECIFICATION forming part of Letters Patent No. 532,252, dated January8, 1895. Application fiied January 5,1894. Serial N... 495.842- N0model.)

To all whom it may concern:

Be it known that I, WALTER. KNOWLES TROTMAN, a subject of the Queen ofEngland, residing at London, England, have invented Improved Apparatusfor Watermarking Paper, of which the following is a specification.

When it is desired to watermark paper in the course of manufacture on amachine, it has heretofore generally been accomplished by means of adandy-roll having -the device of such watermark formed by sewing,solder.- lng or similarly securing wire or the like on its peripherywhich. device stands out in relief thereon. This method has necessitatedthe employment of a separate dandy-roll as well for each watermarkas fordifierent sizes of paper.

My invention has for its object to overcome that necessity, andcomprises the provision of means whereby the watermarking letters ordevices may be interchanged without the removal and substitution of afresh dandy roll.

The invention will be best understood by reference to the accompanyingdrawings, in which Figure 1 is a view partly in elevation and partly inlongitudinal section of a roll constructed according to my invention.Figs. 2,

3 and 4 are transverse sections taken respectively on the lines 2-2, 33and 4:& of Fig. 1.

Fig. 5 is a section corresponding with Fig. i of the roll arranged forwatermarkinga larger size of paper than that for which the roll asarranged in Figs. 1 to 4: is designed. Fig. 6 is a plan of one of thepad carrying frames detached from the roll and Fig. 7 is an edge view ofthe pad with modified means for securing it to the frames. Fig. 8 is asideelevation (partly sectioned) of a portion of a. ma chine with myinvention applied. Fig. 9 is an end view thereof.

Like letters indicate like parts throughout the drawings.

A is a body preferably constructed of metal tube as shown, the ends ofwhich may be closed by metal plugs A provided with journals A by whichthe improved roll is mounted in its hearings in the paper making machineat preferably a short distance away from the tail recesses A dividingits dandy roll which in a machine wherein the water-marking is efiectedaccording to this invention is plain, having no watermarking device uponit. The bodyA is adapted to be removably supported in bearings for thepurpose of allowing collars of different sizes to be placed on said bodyA, and for this purpose I mount the journals A in open'or hook bearingsA vertically adjustable upon a screw rod A mounted in a support Asecured to the machine.

On the tubular body A are provided two conveniently circular fixedcollars A and one or more collars A each having say four doveperipheryinto four equal parts.

B, B are two drums fitting on the ends of the tubular body A at theoutside of the collars A and provided at their inner ends with openingsB large enough to accommodate the ends of the frames 0 and at theirouter ends with openings B to admit of the screwthreaded pins or bolts 0passing through them. Each frame 0 consists of two preferably T-shapedbars or rails C rigidly united at their ends as at C Fig. 6 in anyconvenient manner and at one or more parts by blocks 0 the number andposition of which preferably correspond with the number and position ofthe collars A fixed on the tubular body A. Each of the blocks Otisprovided with a dovetail projection G to fit into one of the beforementioned dovetail recesses A of the collars A and into the ends 0 ofthe frames 0 are screwed or otherwise suitably secured the pins or bolts0.

D is a Watermarking pad or impression plate carrying any desired deviceD to be impressed in relief. This plate is curved to suit the size ofroll to which it is applied. ,At its back the plate D may, as shown inFig. 3, be provided with a bolt or screw D over which is passed aclamping plate D adapted to be forced tightly against the back of thebars 0- by means of the nut D screwing on bolt D By this arrangement thepad D may be Socured in any desired position on the frame on which it ismounted, or the pad D may be retained in position on frame 0 withsufficient in any desired position thereon by again firmness for allpractical purposes by two or more clips D (Fig. 7) secured to the backof said pad and adapted to engage with the outer flanges of each pair ofbars 0 which as shown in dotted lines in Fig. 6 are recessed as at G toadmit of the pad being applied to the frame G as will be wellunderstood. At all parts of the frame excepting at the recesses theclips fit tightly against the outer flanges of the bars 0 so that thepad D will be retained in any position to which it is adjusted untilagain moved by hand.

E Fig. 5 is a collar or ring provided at its interior with dovetailprojections E to fit the dovetail recesses A of collar A and at itsexterior with dovetail recesses E to receive the dovetail projections Oof the blocks 0 all as shown in Fig. 5.

From the foregoing description it will readily be understood that byloosening the nut D the pad D may be moved along the frame 0 on which itis mounted and secured tightening the nut. It will also be obvious thatone, two or more pads D may be mounted at different parts of the sameframe.

In Figs. 1 to 4 I have represented the roll as with accommodation forfour frames 0 (each fitting into one of the openings B) though with onlytwo applied. It will be obvious however that the roll may be constructedfor carrying one, two or any other suitable number of frames and thatany number of frames up to the limit of accommodation may be fitted tothe roll. Thus in Figs. 1 to 4 only two frames C are shown which is twoless than the full complement.

When it is desired to arrange the roll for Watermarking paper of alarger size than that for which it is shown arranged in say Fig. 1, allthat is necessary is to remove the winged nuts 0 from the pins 0', slipthe drums B off the ends of the tubular body A, fit a collar E of thedesired size on the fixed collar A and place drums of the requireddiameter on the ends of A. The ends of the frames 0 are then inserted inthe drum openings B (the diametrically opposite ones of which will befarther apart than in the drums last removed) the pins 0 passed throughopenings B the dovetail projections C engaged with the recesses E andthe winged nuts screwed on the pins 0 until the drums are pressedtightly against the collars A After this the pads are secured in theirproper positions on the necessary frames 0 and the roll is then readyfor use.

The periphery of the drums is in practice to be preferably roughened sothat they may be rotated by contact with the endless apron or bed of thepaper-making machine. I

The before described apparatus may be modified in some respects Withoutdeparting from the spirit of the invention. For example the frames 0 maybe connected to the tubular body A by brackets by means of which theymay be adjusted radially in relation to body A.

I claim 1. In an apparatus for watermarking paper, the combination witha supporting body, of drums mounted thereon and provided at their innerends with openings, collars mounted on the supporting body, apad-supporting frame supported by said collars and extending within theopenings in the drums, threaded bolts carried by the frame and passingthrough the drums, nuts on the outer ends of said bolts, and a pad orimpression plate carried by the frame, as and for the purpose specified. V

2. In an apparatus for watermarking paper, the combination with asupporting body, of drums mounted thereon and provided at their innerends with openings, collars mounted on the supporting body and providedwith radially-arranged dovetailed recesses, pad-supporting framesprovided with dovetailed projections engaging said recesses, said framesextending-through the openings in the drums, threaded rods carried bythe frames and ex tending through the drums and provided with nuts ontheir outer ends, and pads or impression plates carried by the frames,as and for the purpose specified.

3. In an apparatus for watermarking paper, the combination with asupporting body, of drums mounted thereon and provided at their innerends with openings, collars mounted on the supporting body and providedwith dovetailed recesses, collars provided with interior projectionsadapted to engage the said dove tailed recesses, said collars beingprovided with exterior dovetailed recesses, pad-supporting framescarried by the drums and the collars on the supporting body and providedwith dovetailed projections adapted. to engage the exterior recesses ofthe collars and pads or impression plates carried by said frames, as andfor the purpose specified.

4. In an apparatus for watermarking paper, the combination with asupporting body of I drums mounted thereon and provided at their innerends with openings, collars mounted on the supporting body, apad-supporting frame supported by said collars and extending within theopenings in the drums, threaded bolts carried by the frame and passingthrough the drums, nuts on the outer ends of said bolts, a pad orimpression plate, and means for adjustably connecting the said pad orimpression plate with the pad-supporting frame, as and for the purposespecified.

5. In an apparatus for watermarking paper, the combination with asupporting body, of drums mounted thereon and provided at their innerends with openings, collars mounted on the supporting body, apad-supporting frame supported by said collars and extending within theopenings in the drums,

IIO

In testimony whereof I have hereto set my hand in the presence of thetwo subscribing 10 witnesses.

WALTER KNOWLES TROTMAN..

Witnesses:

ALFRED J. BORELT, HARRY B. BRIDGES.

